Lorraine Ridout, of Gabalfa, has not been seen since January 31 and was reported missing the following day.

Since then, officers have carried out extensive enquiries to try and find the grandmother.

South Wales Police said it met Ms Ridout's two daughters yesterday to provide an update on the investigation and reassure them that finding their mother remained a priority.

Inspector Ian Randall, from Fairwater Police Station, said: "We can only imagine how distressing this must be for Lorraine's family and friends.

"On Friday, police divers checked a section of the River Taff near Clarence Bridge, Grangetown, where the family believed Lorraine might have been.

"South Wales Police has been, and will continue to do, everything possible to find Lorraine."

Ms Ridout was last seen at the Premier Shop on Gabalfa Avenue and there have been no confirmed sightings since.

Police have carried out searches of the River Taff and the Taff Trail, used police dogs and specialist search officers as well as air support.

A force spokeswoman added: "Other enquiries have included speaking with Lorraine's family, friends and people who know her, checking hostels, night shelters and hospitals as well as a detailed examination of CCTV in areas Lorraine is known to frequent."

Charity Missing People has also produced more than 1,000 posters - which have been distributed around the Cardiff area by friends, family and locals.

Anyone able to help the police with their investigation should call South Wales Police on 01656 655555 or 101.